Goodwill and Other Intangible Assets (Schedule Of Intangible Assets Gross Carrying Amounts And Accumulated Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Other Intangible Assets [Line Items]
Goodwill	$ 323,616	$ 291,157	$ 282,300
Patents [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	1,000	1,000
Less: accumulated amortization	800	800
Net	200	200
Capitalized Software [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	54,000	45,500
Less: accumulated amortization	26,700	20,100
Net	27,300	25,400
Customer Relationships [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	111,900	70,500
Less: accumulated amortization	28,600	24,700
Net	83,300	45,800
Other [Member]
Goodwill and Other Intangible Assets [Line Items]
Gross carrying amount	2,800	2,600
Less: accumulated amortization	900	400
Net	1,900	2,200
Trade names [Member]
Goodwill and Other Intangible Assets [Line Items]
Trade names	$ 119,100	$ 117,100